(serving size: 1 slice)
- Prep Time: 30 minutes
- Cook Time: 1 hour
- Total Time: 1 hour 30 minutes
Heat the oven to 350° F. Whisk together the flour, baking powder and salt in a small bowl and set aside.
In the bowl of a standing mixer or handheld beaters, cream the sugar and butter until very light and fluffy. Scrape down the sides of the bowl with a spatula.
Add the dry ingredients and the eggs all at once, and beat until combined, scraping down the bowl once or twice.
Spread the batter into an 8 or 9-inch spring form pan. Arrange the plum halves, skin side up, on top of the batter in concentric circles. Sprinkle the batter and fruit lightly with turbinado sugar and cinnamon (I use about 2 teaspoons of sugar and 1/2 teaspoon of cinnamon, but adjust these to your taste).